DISSOCIATIVE ELECTRON-ATTACHMENT TO OZONE USING A HIGH-RESOLUTION CROSSED BEAMS TECHNIQUE

The production of O- and O-2(-) by dissociative attachment to ozone ha s been studied as a function of electron energy (from about 0 up to ab out 9 eV) in a recently constructed high-resolution crossed beams appa ratus combined with a quadrupole mass spectrometer. After absolute cal ibration of the ozone gas density and taking into account the differen t detection efficiency absolute attachment cross sections for both fra gment anions could be deduced. The corresponding peak values are 2.8 x 10(-17) cm(-2) at an electron energy of 1.33 eV and 1.83 x 10(-17) cm 2 at an electron energy of 1.05 eV for the O- and O-2(-) production, r espectively.